In 3D computer graphics, ray tracing is a technique for modeling light transport for use in a wide variety of rendering algorithms for generating digital images.

Practice constructing a proper ray diagram by dragging the end points for orange, purple, and red DIY rays. The correct position and size of the image is shown for a thin lens or mirror of focal length f.

Light rays do not interfere with each other if they cross (light is invisible!) Light rays travel from the light sources to the eye (but the physics is invariant under path reversal - reciprocity). 1. Substitute ray equation. Quadric: Spheres, ...

In order to test whether a ray hits a transformed object, we need to describe the ray in the object’s local coordinates. We transform the ray by the inverse of the local to world matrix, T-1. If the ray is defined by P(t) = E + tD then the ray in local coordinates is defined by T-1(P(t)) = T-1(E) + t(T-1 3x3 D) where T-1 3x3

Light rays travel from the light sources to the eye (but the physics is invariant under path reversal - reciprocity). Shooting rays to determine whether a surface is visible from a light source. The plane is all points p’, where p’- p is orthogonal to n. Want t where the ray intersects the plane... What About Rays Parallel to a Plane?

Ray tracing is probably the best known technique for higher quality graphics. The idea behind it is not complicated: To find out what you see when you look in a given direction, consider a ray of light that arrives at your location from that direction, and follow that light ray backwards to see where it came from.

Acceleration techniques for ray tracing large numbers of geometric primitives CS348B Lecture 2 Pat Hanrahan, Spring 2005 Classic Ray Tracing Greeks: Do light rays proceed from the eye to the light, or from the light to the eye? Gauss: Rays through lenses Three ideas about light 1. Light rays travel in straight lines

Raytracing simulates light rays moving through a scene, and can produce physically accurate representations, as explored in detail in CS348B. In this course we will settle for an approximation of light transport through a scene by limiting and approximating the …

Ray tracing is a technique used for rendering scenes with 3d geometry. It is well-suited for ren-dering objects realistically and is based on modeling how individual light rays bounce and scatter before reaching our eyes. The downside however is that ray tracing is fairly time-consuming and often too slow for interactive 3d applications.

Two dominant methods for finding primary ray intersections with the scene are ray casting and rasterization. These methods leverage the same underlying mathematics of solving for the point closest to the ray origin that satisfies a primary ray’s explicit equation and the primitive’s (e.g., triangle’s, sphere’s) implicit equation.